I have a small Jersey heifer that just calved. Her back teats are large and full and producing milk, but her front two teats are not. They are full at the base as if they were starting to get full but didn't. I tugged on them and nothing came out, they are red or swollen or feverish and no injury seems to have happened. I have had her since she was a couple of weeks old and never saw suckling on her by other calves. She had a heifer calf less than 24 hours ago and has a very large udder and the back teats are producing just fine. Any ideas on whats going on here?